Harpies

First introduced as interceptor type, ambush class angeloids type gamma, they were manufactured alongside as first generation angeloids equipped with razor sharp claws at their right arm and a long-range armament called "Prometheus" a weapon that is able to shoot flaming hot projectiles that can reach up to 3000 degrees celsius in 3 or 4 km/s. They are the series' second antagonists(next to the Man of Synapse) that answers directly to the Man of Synapse and are the guards to the entrance of synapse itself, they're first shown in a short clip after the ending credits of episode 12 in Sora no Otoshimono: first season as they show their presence in front of Nymph, in episode 13 they were the ones responsible for the lost of Nymphs wings as they tore them infront of Ikaros. They were outstandingly beaten as Ikaros summons the uranus system and overpowered their prometheus' in firepower and size thus sending them back to Synapse. As Sugata Eishirou repeatedly time travels from synapse it is without a doubt the patience of these harpies grow to insurmountable levels as they from time-to-time miss the opportunity in taking out Sugata's life.